Justification of Ecoregion DelineationThis ecoregion is equivalent to the DMEER (2000) unit of the same name. It primarily consists of lowland to submontane acidophilous oak and mixed oak forests, mixed oak-ash forests in the UK and Ireland. The ecoregion also includes small areas of western boreal and nemoral-montane birch forests, fen and swamp forests, as well as flood-plain, estuarine, and freshwater polder vegetation, and the ombrotrophic mires of northern England and southern Scotland (Bohn et al. 2000).